Tuning the influence of metal nanoparticles on ZnO photoluminescence by atomic-layer-deposited dielectric spacer

Nanophotonics

article

Monan Liu¹  Rui Chen¹  Giorgio Adamo²  Kevin F. MacDonald²  Edbert J. Sie¹  Tze Chien Sum¹  Nikolay I. Zheludev²  Handong Sun¹  Hong Jin Fan¹ 

[1] Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University;Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton;Centre for Disruptive Photonic Technologies, Nanyang Technological University;Singapore-Berkeley Research Initiative for Sustainable Energy (SinBeRISE)

关键词: ZnO nanowires;    surface plasmons;    metal nanoparticles;    photoluminescence;    cathodoluminescence;    atomic layer deposition;    PACS 78.67.-n;    78.55.-m;    78.60.Hk;    78.67.Uh;   

DOI  :  10.1515/nanoph-2012-0040

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

There is increasing interest in tuning the optical and optoelectronic properties of semiconductor nanostructures using metal nanoparticles in their applications in light-emitting and detection devices. In this work we study the effect of a dielectric Al 2 O 3 gap layer (i.e., spacer) on the interaction of ZnO nanowires with metal nanoparticles. The Al 2 O 3 spacer thickness is varied in the range of 1–25 nm using atomic layer deposition (ALD) in order to tune the interaction. It is found that ~5 nm is an optimum spacer thickness common for most metals, although the enhancement ratio of the near-bandedge emission differs among the metals. Consistent results are obtained from both photoluminescence (PL) and cathodoluminescence (CL) spectroscopies, with the latter being applied to the optical properties of individual semiconductor/metal nanoheterostructures. The interaction is primarily proposed to be related to coupling of ZnO excitons with local surface plasmons of metals, although other mechanisms should not be ruled out.

【 授权许可】

CC BY